I have magnum heads on my 360LA, it's just a few things you should do. I tapped and plugged the oil passages in the block, used lifters that oil through the push rods (AMC type) and then measure for the correct pushrod length and use magnum style pushrods (hollow). One more thing, make sure the magnum heads you get are drilled for a LA type intake. My motor is sitting on the engine stand waiting for warmer weather, it's cold out there!
Still running that LA with magnum heads? I've had a shop build a 73 360LA with Edelbrock magnum heads, and I have all kinds of problems with the lifters. Curious about the work you had done to the block ... can you be more specific?
Thanks - tried to send a private message, mailbox was full.
